[sanitizers] Fix FreeBSD compilation after d568e5325c744dadf08729aee0819a8954a955f5

[arichardson]

Summary

FreeBSD doesn't use sanitizer_platform_limits_posix.h, so we get an
undefined reference to wordexp_wrde_dooffs error.
For some reason this currently triggers
warning: unused variable 'wordexp_wrde_dooffs' [-Wunused-const-variable]
while building sanitizer_platform_limits_freebsd.cpp despite the extern
declaration.

[justincady]

Thanks for fixing this. When I saw <wordexp.h> conditionally included for everything except Android, I mistakenly assumed Android was the only platform that needed to be handled differently.

LGTM.

[arichardson]

Same fix was committed in D108838 / 84013d7093c929061073c276a374c72ee77755f9

compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_freebsd.h

struct __sanitizer_glob_t {
   int (*gl_stat)(const char *, void * /* struct stat* */);
 };
 
 extern int glob_nomatch;
 extern int glob_altdirfunc;
 
 extern unsigned path_max;
 
+extern const int wordexp_wrde_dooffs;
+
 struct __sanitizer_wordexp_t {
   uptr we_wordc;
   char **we_wordv;
   uptr we_offs;
   char *we_strings;
   uptr we_nbytes;
 };
 

compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_freebsd.cpp

 // Can't write checks for sa_handler and sa_sigaction due to them being
 // preprocessor macros.
 CHECK_STRUCT_SIZE_AND_OFFSET(sigaction, sa_mask);
 
 CHECK_TYPE_SIZE(wordexp_t);
 CHECK_SIZE_AND_OFFSET(wordexp_t, we_wordc);
 CHECK_SIZE_AND_OFFSET(wordexp_t, we_wordv);
 CHECK_SIZE_AND_OFFSET(wordexp_t, we_offs);
+const int wordexp_wrde_dooffs = WRDE_DOOFFS;
 
 CHECK_TYPE_SIZE(tm);
 CHECK_SIZE_AND_OFFSET(tm, tm_sec);
 CHECK_SIZE_AND_OFFSET(tm, tm_min);
 CHECK_SIZE_AND_OFFSET(tm, tm_hour);
 CHECK_SIZE_AND_OFFSET(tm, tm_mday);
 CHECK_SIZE_AND_OFFSET(tm, tm_mon);
 CHECK_SIZE_AND_OFFSET(tm, tm_year);